Clean up makefiles with a source grabber function

kernel/Makefile

@@ -1,3 +1,5 @@
+include $(ROOT)/mk/grabsrc.mk
+
 .PHONY: all clean
 
 ARCH ?= x86_64
@@ -6,7 +8,7 @@ PUTCHAR_ ?= fb
 CFLAGS := -ffreestanding -Wall -Wextra -g -fcommon -nostdinc
 
 CFLAGS += -I. \
-					-I../limine \
+					-I$(ROOT)/limine \
 					-I./std/include \
 					-I./flanterm/src \
 					-DPRINTF_INCLUDE_CONFIG_H=1 \
@@ -31,40 +33,39 @@ include extconf/extra.mk
 
 LDFLAGS += -nostdlib -static -T arch/$(ARCH)/link.ld $(shell $(CC) -print-libgcc-file-name)
 
-SRCFILES := $(wildcard *.c) \
-	$(wildcard printf/*.c) \
-	$(wildcard bitmap/*.c) \
-	$(wildcard pmm/*.c) \
-	$(wildcard bootinfo/*.c) \
-	$(wildcard spinlock/*.c) \
-	$(wildcard term/*.c) \
-	$(wildcard vmm/*.c) \
-	$(wildcard dlmalloc/*.c) \
-	$(wildcard vfs/*.c) \
-	$(wildcard storedev/*.c) \
-	$(wildcard util/*.c) \
-	$(wildcard fs/kvfs/*.c) \
-	$(wildcard fs/littlefs/*.c) \
-	$(wildcard fs/portlfs/*.c) \
-	$(wildcard baseimg/*.c) \
-	$(wildcard proc/*.c) \
-	$(wildcard hal/*.c) \
-	$(wildcard hal/$(ARCH)/*.c) \
-	$(wildcard hal/$(ARCH)/*.S) \
-	$(wildcard paging/$(ARCH)/*.c) \
-	$(wildcard paging/*.c) \
-	$(wildcard *.S) \
-	$(wildcard std/*.c) \
-	$(wildcard flanterm/src/*.c) \
-	$(wildcard flanterm/src/flanterm_backends/*.c)
+SRCFILES :=
+
+SRCFILES += $(call GRABSRC, \
+							printf \
+							bitmap \
+							pmm \
+							bootinfo \
+							spinlock \
+							term \
+							vmm \
+							dlmalloc \
+							vfs \
+							storedev \
+							util \
+							fs/kvfs \
+							fs/littlefs \
+							fs/portlfs \
+							baseimg \
+							proc \
+							hal \
+							hal/$(ARCH) \
+							std \
+							flanterm/src \
+							flanterm/src/flanterm_backends \
+						)
 
 ifeq ($(ARCH),x86_64)
-	SRCFILES += $(wildcard hal/x86_64/uACPI/source/*.c)
+	SRCFILES += $(call GRABSRC, hal/x86_64/uACPI/source)
 endif
 
-CFILES := $(filter %.c,$(SRCFILES))
-ASFILES := $(filter %.S,$(SRCFILES))
-OBJ := $(patsubst %.c,%.o,$(CFILES)) $(patsubst %.S,%.o,$(ASFILES))
+CFILES  := $(call GET_CFILES, $(SRCFILES))
+ASFILES := $(call GET_ASFILES, $(SRCFILES))
+OBJ := $(call GET_OBJ, $(SRCFILES))
 
 %.o: %.c
 	$(CC) $(CFLAGS) -c $< -o $@